In some fanfiction, their children might get involved in a time - travel adventure. They could go back in time to witness important events from their parents' past, like the first time Percy and Annabeth met. This would not only give them a deeper understanding of their parents but also potentially change the course of events in the present if they interfere in the past in some way.
Perhaps a storyline where Percy and Annabeth's children have to team up with other demigod kids to battle a new and powerful monster. They could be learning new powers and skills along the way, while also trying to live up to the legacies of their famous parents. Their relationships with each other and with their parents would be an important part of the story as well.
One possible storyline could be their children going on a quest to discover a new hidden part of the demigod world. Maybe they have to find a lost artifact that is crucial for the safety of Camp Half - Blood. Another could be their children facing challenges at school, dealing with both normal school problems and the added pressure of being demigods.
Perhaps they go on a quest to find a way to close the gates of Tartarus permanently. This would involve traveling to different places, facing new monsters, and using their combined knowledge and skills. Along the way, their bond would be tested, and they'd have to rely on each other more than ever, making their relationship even deeper.
One possible storyline could be that their daughter inherits both of their special abilities. For example, she might have Percy's skill with water and Annabeth's strategic mind. She could go on adventures in the same world as her parents, facing new monsters and challenges. Maybe she discovers a long - lost secret related to the gods that her parents were unaware of.
One possible storyline could be them dealing with PTSD. Percy might have nightmares about the horrors in Tartarus, and Annabeth could struggle with sudden bouts of anxiety in seemingly safe situations. They would have to support each other through these tough times, learning to communicate better about their feelings.
One possible storyline could be a powerful new enemy emerging. This enemy could be a long - lost primordial being. They manage to overpower Percy and Annabeth in a battle that was unexpected. Maybe they were lured into a trap where their powers were nullified, and they couldn't fight back effectively. Another storyline could be a self - sacrifice. For example, to save their friends or the whole of Camp Half - Blood, they choose to face a great danger alone, knowing that they won't survive.
Well, one possible reason could be that Percy made a really stupid decision without consulting Annabeth first. Like, if he went off on a dangerous mission on his own when they were supposed to be a team. Annabeth is a very strategic person and she might feel betrayed or extremely frustrated by such actions.
It could also be due to some sort of magic or mind - control. A powerful enemy might have cast a spell on Annabeth, forcing her to turn against Percy. In this case, it's not really her own will but the result of external manipulation.
One possible reason could be a misunderstanding. Maybe she saw Percy doing something that she misinterpreted as a betrayal of their friendship or their cause. For example, if Percy was seen talking secretly with an enemy, Annabeth might jump to conclusions without knowing the full story.
Perhaps they are from rival kingdoms that have been at war for generations. They meet by chance in a neutral territory and instead of fighting, they start to talk. They realize that the war has been caused by misunderstandings between their families. So, they decide to work together to end the war. They face opposition from their own families and kingdoms, but their love for each other gives them the strength to persevere and bring peace.
One possible storyline could be Percy and Annabeth dealing with the emotional aftermath. They might struggle with feelings of guilt and grief. Percy could become overly protective of Annabeth, while she might feel like she has failed in some way. Another storyline could involve them seeking support from their friends in the demigod community, like Grover or Piper, who help them through this difficult time.
Perhaps Annabeth made a decision without consulting Percy that put him in danger. In the fanfiction world, this could lead to her feeling guilty and apologizing. For example, if she led their group into a trap because of her over - confidence, she'd realize her mistake and say sorry to Percy.